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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair value adjustment, tax $ 11 $ 1 $ 9
Net (loss) income arising from retirement benefit obligations, tax (135) 211 (589)
Amortization of loss included in net income, tax $ 36 $ 53 $ 19